A VERY LOW-TC SECOND-ORDER TEMPERATURE-COMPENSATED CMOS CURRENT REFERENCE

作者：Liang, Liang^*; Zhu, Zhangming; Yang, Yintang

来源：Journal of Circuits, Systems, and Computers, 2014, 23(3): 1450042.

DOI：10.1142/S021812661450042X

• Analog integrated circuits
• CMOS current reference
• temperature compensation
• thermal drift
• temperature coefficient
• sub-threshold MOSFET

This paper proposes a novel second-order temperature-compensated CMOS current reference which exploits a new self-biased current source forrst-order temperature compensation and a resistor-free widlar current mirror for second-order temperature compensation. Moreover, by deriving the temperature coecient (TC) of the reference current, the temperature compensation condition equations together with a design method of minimizing the thermal drift in a required temperature range are presented. Based on these, the circuit is designed in a standard 0.18 mu m CMOS process and achieves a very low TC of only 16.9 ppm/C in a temperature range between -40 degrees C and 120 degrees C, with 1 degrees A reference current at 27 degrees C. Besides, the current reference can operate at supply voltage down to 1.3 V, with a good supply regulation of 0.5%/V. At 27 degrees C, its power consumption is 8.93 degrees W.

• 出版日期2014-3
• 单位西安电子科技大学